Power-hammer



E .v F. K ARLSON. POWER HAMMER. APPLICATION FILED MAY'I3. |920.

1,400,166. Patented De@A 13, 1921.

3 SHEETS-SHEET l- E. F. KARLsoN. v POWER HAMMER. APPUCATIONA FILED MAY 13,1920.

Patented Dec. 13, 1921.

untreul STAT-Es PATENT GFFI'CE.

POWER-HAMMER.

Specification of Letters 1atent.

Patented 1360.13, 1921".

AppIcaton led May 13, 1920. Serial No. 381,093.

To all whom it may concern.'

Be it known that I, ERIC F. KAnLsoN, a citizen of Canada, residing at Beaumont, in the county of Jefferson and State of Texas, have invented certain new and useful Improvements in Power-Hammers, of which the following is a specification.

This invention relates to improvements in power hammers. One object is to provide a power hammer adapted to be operated from any power source and adapted particularly for use in small machine shops, blacksmith shops and the like. A further object is to provide a power hammer that can be easily operated by one attendant, that is of few parts and consequent`y cheap to manufacture. W'ith the foregoing and other objects in View the invention consists in the combination and arrangement of parts to be hereinafter fully described, pointed out in the appended claims and illustrated in the accompanying .drawings which'form a part of this specification and'in which- Figure 1 is a side elevation of my improved power hammer.

F ig. 2 is a top plan View of the same, enlarged.

vF ig. 3 is a fragmentary sectional view of the device.

Fig. 4 is a cross section' online 4 4 of Fig; 1. i

ig. 5 is a view of Fig. 4 in side elevation. Like reference characters denote corresponding parts throughout the several views. The reference numeral 1 denotes the shop floor or bed plate of the machine upon which the anvil 2 is arranged, and 3 is a supporting surface for the machineA proper. To the supporting surface 3 I securea casting 4 by the bolts 5 and journaled in said casting and extendingV longitudinally and approximately centrally thereof is the vertically disposed drive shaft 6 which shaft at its lower end is connected by bevel gears 7 to the power shaft 8. VThe upper end of said shaft rises above the top of the casting 4 and arranged about said shaft as a center is a ball race 9 for the ball bearings 10 upon which the cam wheel 11 is disposed, the hub of said wheel being fast to the said rotary shaft 6. Adapted to ride upon the cam edge 12 of said cam Wheel is a roller 13 carried at the reduced end of the inclined shaft 14 whereby the collar 15 is fixedly secured to the plunger hammer 16 that operates through guide bearings 17 integral with the said casting 4. Als the said cam wheel is rotated by the shaft 6 'in the direction denoted by the arrow 18 the roller 13 is picked up by the cam edge 12, at its lowest point, and raised until the highest point of said cam edge isreached from which point the roller and connections are dropped thus permitting the plunger hammer 16 to drop and deliver a blow upon the anvil 2 directly therebeneath. The maximum distance of the lower end of the plunger hammer from the anvil is substantially equal to the depth of the cam edge 12 at its highest point. Upon the reduced portion 19 of said plunger hammer an expansion spring 2O is arranged which abuts one Guide bearing 17 and the annular shoulder 21 formed upon said plunger hammer by the termination ofits reduced portion, said spring serving to accelerate the descent of said plunger hammer and thereby to increase its eiiiciency. The work under operation is placed upon the anvil 2 and the shaft 6 put in motion when the plunger hammer will be caused to rise and fall successively thereby delivering a series of blows upon the work.

The shaft 6 is formed with a key-way 22, vertically disposed, to receive the key of a cam 23 which rotates with said shaft, said cam being moved longitudinally of said shaft from the position shown in full lines in Fig. 5 to the position shown dotted, or

vice versa, through the medium of the inf verted `U-shaped link 24 which is pivotally connected by bar 25 to the rotary rod 26, that extends through the casting, said'rod 26 being oscillated by the bellcrank 27.. In the position of the bell crank shown in dotted lines in Fig. 5 the cam is raised upon the shaft and in the position shown in full linesthe cam is in lowered position and in engagement with the brake rod 28 which is slidably carried by the casting and which carries the brake shoe 29 adapted for frictional engagement with the plunger ham- .men A spring 30 arranged upon said brake rod abuts a collar 31, fast upon said rod, and a portion of the casting 4 to yieldingly retain the brake rod in a predetermined position and the brake shoe out of engagement with the said plunger hammer.

The plunger hammer is formed with a notch 32 which, in the raised position of said hammer, is adapted to receive the extreme tip end of a slide block 33 that works in a slot 34 formed in the casting 4t and in one guide bearing 17, said slide bloclr being engaged by a rod 35 which connects it with a piece 36 of the casting, said rod 35 being movable relatively to said piece 3G and a spring 37 encircling said rod and abutting the piece Y36 andslide block serving yieldingly to space said members apart. A lever 38 also connected to the slide block and fulcrumed upon pin 39 to the casting permits manual control of saidslide bloclnsaid lever being retained in adjusted position by a catch ll() arranged upon the casting. When the poweris shut oifand it is desired to retain the hammer in raised position the' hammer,

while in this position, is engaged by the slide Y block and descent of the hammer through gravity or expansion ofthe spring `thereby prevented.

x The brake rod and connections are not thrown into operation to stop the plunger hammer but merely to soften or lighten its blows.y lThe maximum blow will be struck by the hammer when the brake is Vin inoperative position. The cam 23 is sopositioned.

upon the shaft 6 that it will cause the brake shoe to grip the plunger hammer immediately-after the roller 13 has passed beyond` the eXtreme high Joint of the cam edge l2. Whatis claimed is Y l. In a power hammer, a casting, a rotary shaft journaled in said casting, a plunger hammer arranged yin said casting in spaced parallel relation to said rotary shaft, a cam wheel fast upon one end of said ro- 'tary shaft, means connecting said cam wheel Y member,'said means' including a roller adapt-' v40 and plunger hammer for raising said latter and means adapted for engagement with said plunger rhammer immediately after said roller has passed over the extreme high point of said cam wheel-whereby .the succeeding movement of said plunger hammer is retarded, said means including a brake shoe.

3. In a power hammer, a casting, a rotary shaft journaled in said casting, a plunger hammer arranged in said casting, means connecting said rotary shaft and plunger ha i-- mer for alternatelyraising and releasing said latter member, said meansincludi-ng a roller adapted to travel over one edge of said cam wheel, and means adapted for intermittent engagement, with said plungerV hammer Y whereby the velocity of the drop ofl said hammer is retarded.

4: In a power hammer, a casting, a rotary shaft journaled in said casting, a plunger hammer arranged in said casting, means connecting said rotary shaft and plunger hammer whereby motion is intermittently im- Y arted yto said latter member, a brake carried y said.- casting for releasable engagement with saidplunger hammer, brake actuating means arranged upon said rotary shaft,andV

manually. controlled means whereby said brake actuating meansmay be moved'into or Vout of operative engagement with said brakef Y, Y

. 5. In a powerhammer, a casting, a rotary shaft journaled in'said casting, a plunger hammer arranged'in said casting, means connecting said rotary shaft and plunger hammer `whereby motion .is intermittently imparted to said latter'member, a brake carried by said casting for releasable engagement withsaid plunger hammer, a cam slidably keyed to Vand rotative with said rotary shaft'for disposition in or out of -eontiguity I. Y

with 'Said brake, said camwhen in contiguity with said brake imparting an intermittent movement thereto, and manually operable means for positioning said cam. Y Y

In testimony that Ilclaim the foregoing as my'own I have hereto atliXedmy signature in the presence of two subscribing witnesses.

ERIC FRI'IVJOF KARLSON,

v Witnesses: L; Y

' Gorrnm JoHNsoN,

J, P. I-IorLER. 

